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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a61503c793a63bae469a3e6b121be7ef61df6f88e71cb79168929ec88c33c12' 
  AND token = '7hiDHKoK2OWm0EP+VcDsmSO3lbr+/iNQgsMPb5SeB8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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