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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '776b4a9a815a7175040922555a0405665ea81cb6439d874c16874faf4b809040' 
  AND token = 'K7owy1gn5MSy4FPoRz2/28nyoVeKapOC3KWlwfkd6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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