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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e64ce2505b273dafb00f3e201566a7c87bbc88bd70546e34a88b24bea207c42' 
  AND token = 'tlXJ68k5dCPgQhKCk36zymWuetF5Sng9OFdjBJDy99A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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