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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef92701f91b3deeadd1f4e2723e0e80f1c3f0f9986aa15b909db6da3eba868b7' 
  AND token = '4QZpIVroMemAEX3EkeCV+vjYgdm1opSrwnV4qjLbLQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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