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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'facc3ba7c3d59db7418888aaa2a6cfc94f0fdf30789ea4bcf01dd2297e0c0d83' 
  AND token = 'm2+4YXAUn3Llc9Zz5X7ee6ycB44xzSuwpy7l873IOlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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