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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e69c5e69a319f78abd6ac3e97f7dd264e24bae82f9a62863a823b91d3bb3adbb' 
  AND token = '/Cb2FAbTdhZemRsX4PtCkzBSIY/QUlzaxUHEprvSrCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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