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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c272d2e5e555cd74f642f646da6b7e1b59736b934e57fac3a8603a92c2607a' 
  AND token = 'Z64IuKEUO/GO2l0BJUfbvr9FCO9L9HdnghOzC6DEcyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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