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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '882081f11c9b89204890a7d94693982922678204412f91cead25cba1ad926da7' 
  AND token = 'l1XFL5CUB6rsiqajt75mCqPCk76P3VW1mjbXM4y/BBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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