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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c678f03d7fa012932461eb80b98dea8d22ec8398a36470c90fad2b202721c1c' 
  AND token = 'eDYXayuUn6ZZgJzQ9cV3nFYtH/O9IT/V0Y5WJtE6LKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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