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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa2101c42862a3c62bed9992be9c3e9d1c5de70f35657d0524e6877584382fe' 
  AND token = '4t5rHnR4cV5gW2PGaoC8oa2bUfXNCp3ANsKXRvP6S80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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