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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4855ee796557323d155669e81f5c36b5c3904eb2bd7a594c8f83d025cd21f110' 
  AND token = 's7bFEieP3fCnNLxBbM5QoYylr7jxbzgXXxfhTWaDhVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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