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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82602c0489c6b7735bcae6259f6df79f901fa4007e4d3167f0a46eeee078e855' 
  AND token = 'fTO6/eKJFDu32dFAhJ4MzULu2X8zwoCgzz4L8Ik5zIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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