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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c49817865e9bb817fb243487988137fe5637b8a035e1161aa1999943e47fdd43' 
  AND token = 'aFkph3pHepW0Cv7eMbPc2xn7ecBHtE4se1sGKe+iluE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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