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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6524e686ae977d5775c634f11b3afe93958e1531530aa8545e8a04348953e2ff' 
  AND token = '4vXFpLI9K9K0pOAT2IOxthITbkyhPEoVWD1xygE/y2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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