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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4d2d29ade6f72a178cb2fbbbaa1642bde6fbcce2ccd2634f3ed5ad5a24568a0' 
  AND token = 'zgz+thoPOBe5CRAgTAeOFvf2LMwQiva4xgmVabEDpEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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