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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a4a6a93ec2ccebbcdbd9357a1a566c925bf3198ae725187375d6da5739daa4b' 
  AND token = 'JrMBFXzXJs6b0w6kt9uuk7Tr3LcnEMHKttr8y6wqgLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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