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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07ae708172be39fbe782420c76a35d0b0ade886a4f76b6c8b0670428967ac9eb' 
  AND token = '0qlxZtvRBTNxuetByOdBZ7FY7WVWShe/0IZCUpEGqrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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