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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8a62097ae2427c351cd4f8221e82a60f673ac902cff86092270ed72b526c8fd' 
  AND token = 'aSkf1ezvIGGmwcXXosXaTCfVQTrVRECiXLSlKN7TXL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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