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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f52218844c5750da7b1e0976678029402c305f44fd938d6f0ba29ffaf85668e' 
  AND token = 'M4KRDYNs1XtEW7UTsp2Ay4ua6IR82uozFvJwXBmC9ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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