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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87cfeb98b9bf396a2a9aa9b59dbc82c7447e8fb266b7e7709c27b0e9c20129b4' 
  AND token = 'VzZW+uERn/0t8UQ3Grpgpja/VNg2rnVE29s8UWUnYIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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