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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '729c7d0734a4144388940798e89beda32976dd0a63bdb9972c77b9e4e10b0e6a' 
  AND token = 'RHcMRziu3NicNjn7NqDCtmnLGIgdelG+gQ3W12ks6Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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