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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1362f484f2ea5df4e5db9237edd3831caeb17f53e65aaf391a24b1602fbfa071' 
  AND token = 'w3ZCRm+BpZy8vhsGonesSX97aasMNik/3cMhIksgccE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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