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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43c654c6698d5a6a79beac027c7357770f41fe96f3fd438aeec8f01703d63d53' 
  AND token = 'OxbVbKts4e9hjazu3Aguv+1K78sjTqSL4u0ag8bd1Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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