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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e2dcffeb6cca17ea4bb6e88595c1cd06a18f1c093c11b56bf07f8db7ab8c3c9' 
  AND token = '/CmNa3BNv6cHEKy4urcTAS3ZXqbAWqnzsqr13Zwp0VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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