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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c2f916da64f7565fa8585d0c8c67e9ba7adc245aaff1e8dc8aa9fa5429207c' 
  AND token = 'pgThj7hnzztlTkSMNTKCa7rDua5b4cMcJWiBkS0IP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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