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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e0d1b4e3ee4f2a9894547745526554d887fda788744bfc7d1c7725187d79e82' 
  AND token = '6maFAg5Rxpg/3gTJeJdDb3i2EIBm1ua+FD5z5JRYHOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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