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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f30f16e485805b842da12247e4b60e46b8da502a9de8c679b05120c3c16ee42' 
  AND token = 'T1eatYXBh3n+gGyOy1/pEV6slEpRXzu0oV0LXIyyL0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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