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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '276fb92dce19e94b1ea64bdb03c4954864071a9e60ddb65fbae0b4f2c3f52439' 
  AND token = 'qGBM6wBrQaifO22BZiAMBqY/kmc3l7Z7kzvptePZB2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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