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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1eacbb44bf5da4acfcca48854850c8205d845335f6f14f43c099a7272e9c09' 
  AND token = 'Eo1/0c31Y+lOcOkVxnGgq+BVWSTrPZN9s4MG005PgLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}