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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac0f7e2cc513bc8712997b02a15f860a475eb6ed69df2228d3ba109fcaff37ac' 
  AND token = 'sizHbSCo7VctSh7bSMzxUDydS6OhmZtxiNeYb9Glrks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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