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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2112a55de05371ea58203aa9b6cf1d7ae92ea074c81e18790ac3528ed1981892' 
  AND token = 'HjEWsnoewY2bd/Qzwz9t7R1o4gVjM5ixejQBoVbAZ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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