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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6859f880ed1285433d2b8b6724120f80bb5d6d90843cced3ea7ee4a96392251' 
  AND token = '5oOWzp8EU84NgpnzLbnooom6GuFo7FoD4iKN6ndeF5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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