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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '048298a81cf3d43600f5ea53d3e5b53345fe0179f54e362f0469659c18725363' 
  AND token = 'EqFAhEX9WMhtKbcASORcS5FkYEFMESXvNMOmOQaT3Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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