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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f10c0486afdb87a294ef603041d2a7c896579fca9664f52ca7f4a5f4f6df05' 
  AND token = 'iPm3+GldfJcj/ptMxhiMQ9YNyo3NZZTOcKIeFsJRraQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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