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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b24eaf0e5fae398dcac73eb2a6927c88ba7039fe0ec04803c1d921482f47349' 
  AND token = 'iLg+4oaF+1yMlqgmU7y56+yOIhfAwm0qfMBeDWVtKkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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