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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c338a602bc75a221db86acea2562d83a39759ba11371518f522383d90953d9a' 
  AND token = '451GR1Rcm/o+8XfT+TveUM1ULH0QktFL2GT+8IcTm4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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