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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be331f7166119bb19339ade01066520244049ecc24ef52b6b23e48b4bb43b856' 
  AND token = 'vEwimIVN67X2Gyj0NhDoM8nXWoeB21zmOG12J+61F0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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