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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b33b7947e604fe4b0b652e5aa0edf070095d19f3848ac8ade635137e29285df7' 
  AND token = 'lwXJLrQoodqbr9qHkLkL3gnaa62qlay5ghai46un10M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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