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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '783e3feec2a28f9ccb79cadc24fa8f8f45bd24f2d67cdb53a87333ecea25874f' 
  AND token = 'mt2l2TWV6Ihx+oLc/7U2Nx9WCInNPsCkYS1fBEM+Wis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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