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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19f098abeb857693dbaffc486fdbd17bc41eb240da60c4494146e9076a58c83a' 
  AND token = '2n5+kdHN2ShINHKLRQ/FfL4AmaZz/6e2st7sBKFrWxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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