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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb734fb2befd4a86ef4a75b1aba3c4bee981861488e80a996c0cd434c51333c5' 
  AND token = 'PjIpvm+FaOTleMBIOP151gp2bNcCnwHFBz7K0Bl1jIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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