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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7cd1fca0f18cb171ac9c976ad5ff4f748c1a5baf45ec6dec1990013e9edb5e1' 
  AND token = 'Pfr/IbRnYvdfURSWTLkWiRcqFDOSKc0Llowa8MJ/3ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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