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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be7e2c6e0273522d770c122515ef3b4a5db5d19610157e9e87e134bc18f4936' 
  AND token = 't6EMYfYrcArkqhryxSpa31MH3rwcxtD65R4d4GszF1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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