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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18bed37c8ee0ce9392bc4c32f23a657b991d0ae25acab6a569beb47d02c9f83d' 
  AND token = 'YofbD+n0j7H9KnNnDKhwXFZCgtCuEBOTf6OP6FaLb0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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