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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d4dfefce79d28b504d5ec038593e7ba3bc450cd70353ea35a74a6d5ebdc1696' 
  AND token = 'Al1NBtYI1ZiY0KYqWypry4DqhJ6bukIYLhtT34oVHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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