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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0be399c526d7e4c3f30ef3f465f72c143f97085d5daadbb440c322cc3f77101' 
  AND token = 'YKCjOmTTt6l6+kp+/JbmKuuyx078/fRkXpkJaFIhuXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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