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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd4a0189526628e09e6e2ac6a61c168e53ff6203b47b1fadc06817bed3c87e8b' 
  AND token = 'qNcMjr/VTZPAA/5312LZbmMVlNyzyQssMq+qwDT5uxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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