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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc72c5260bdfb3ddafd5e453ff1d0f39b6b48e742c292f506ff3bbb98e0e256' 
  AND token = 'dBk0iyRnNyOfM7Gk/TYAbI14GadH4FWQ4pV4KbVNmSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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